Gohberg, I. C.; Krein, M. G. Basic theorems on defect numbers, root numbers and indices of linear operators. (Hungarian) Zbl 0365.47001 Magyar Tud. Akad., Mat. Fiz. Tud. Oszt. Közl. 23(1974), 387-460 (1977). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 17 Documents MSC: 47-02 Research exposition (monographs, survey articles) pertaining to operator theory 47A53 (Semi-) Fredholm operators; index theories PDFBibTeX XMLCite \textit{I. C. Gohberg} and \textit{M. G. Krein}, Magyar Tud. Akad., Mat. Fiz. Tud. Oszt. Közl. 23, 387--460 (1977; Zbl 0365.47001)